Recharging a cell phone battery without a charger may seem impossible but this is not the case. It is possible, even easy, to recharge the battery without the charger, but you will need some extra tools and, so long as you are careful, there will be no harm done to the battery at all. As a matter of fact, if you have a battery that has a hard time taking charge, this process will even fix that issue.
Power off the cell phone and remove the battery from the back of the device.
Cut off all the exposed cables, except for the black and red cables, and then remove the aluminum wrapping.
Plug the USB cable into your computer for 15 minutes and then unplug the USB cable.